Telephone-receiver.



G. E. MATHER. TELEPHONE RECEIVER.

APPLIYCATION FILED JULY 9. I917- 1,279,894. PatentedSepi; 4,191

frwen/or: George 5 Ma fher.

Any

l the diaphra in ".howlent. file being provided to facilitate movement of the U-shaped leaf springs 8, one. leg of each I to UNITED STATES PATENT OFFICE.-

GEORGE E. MATHER, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO WESTERN ELEC- TRIO COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION NEW Yonx.

TELEPHONE-RECEIVER.

Specification of Letters Patent.

radiated Sept. 24, 1918.

Application filed July 9, 191?. Serial No. 1793;21;

To all whom. it may concern Be it known that I. Grzonor: E. MArneR, a citizen of the United States, residing at East Orange, in the countyof Essex and State-of New Jersey, have in vented certain new and useful Imprm'emenl's in 'ljelephonc- Receivers, of which-' the following is a full, clear, concise, and exact description.

This invention relates to the adjustment of vibratory diapln'agms, and more particularly to the adjustment of diaphragms of telephone receivers and the like relative to another part of such apparatus.

The object of the invention is to provide a simple, economical and efficient means to admit of a rapid adjustment of a diaphragm in relation to another" part of the apparatus. To accomplish this object, the diaphragm is secured to a cap by suitable clamping means;

the cap being adjusted on a casing and springs located in suitable grooves, serving to frictionally engage another part of the apparatus to hold the cap and casing in any desired adjusted position. This serves to space the diaphragm, carried by the cap, a suitable distance from the casing and the parts carried thereby.

The drawing illustrates an exploded view ofthe invention as applied to a telepl'ionc receiver designed for use as a l'iowler in train despatching work.

A magnet easing 1 is provided and externally screw-threaded at its upper end to receive a cap internally screw-threaded and.

provided with Ia smooth seat for'a diaphragm 3. The cap 2 carries a horn 4 to concentrate the sound waves emitting from during operation of the diaphragm 3 is held in. the cap 2' by a screw threaded clamping ring 5, which is positioned within the cap to hold the diaphragm in p1ac'e;'spanner grooves 6 ring. The inner side of the ring 5 has a number of grooves 7 1n which arefastened spring being secured at one end to the bottom of its groove '7, while the other leg thereof normally extends a considerable distance above the'lnner surface ,of the ring to engage the upper edge 9 of the casing 1.

The casing 1 has a pair of receiver magnets 10 mounted therein, and to determine the proper air gap between. the diaphragm 3 and the magnets 10, the cap, 2 is screwed on'the easingl and adjusted back and forth until the most satis'tactm'y operating position is found,-whcreu 'ion the friction present between the springs 8 and the top 9 of the casing 1 will hold the parts in this position. The springs 7 serve to take up the back lash of the screw threads at all times and obviate the possibility of destroying the preliminary adjustn'ient; a trouble experienced heretofore where locking rings have been used as turning of thering to lock the cap and c ing in adjusteduposition ot't'en resulted moving the diaphragm"away from the oasing and destroying the 'n'eliminary adjustment. By-locatmg the springs S n the re cess 7, a greater range of adj ustmcnt is'-pos sible, since the spr ngs can be forced down without injury to any-ofthc parts until the ring 5 engages the top Shot-the casing. To

prevent possible injury to the diaphragm the 'iarts-of the receiver are preferably so pro portioned that the diaphragn'i will not be forced against the endsof the magnets 10 even though the cap 2 be adjusted to bring the ring 5 into engagement with the top 9. of the casing. By using Ushaped leaf springs, a. greater area of contact is provided between the upper edgeofthe casing and ermits of smoother operation during ad ustment.

. This arrangement, while especially suitv able for receivers wherein it is desired to adjust the air gap between the receiver magnet and diaphragm, may also be used in a variety of other places-where it is desired to provide adjustment between a vibrator-y diaphragm and ratus.

What is claimed is: g 1. A diaphragm adjustment for telephones and, the like comprising a casing some other part of the appamembcr, a cap member, one of said members having a. notch therein, means to provide adjustment between said members, a diaphragm carried by one oi? said members and movable therewith, and a U-shaped spring "POSll'JOllGll in said notch, one end of said spring being secured to the bottom of said notch and the other cnd of said spring engaging said other member to hold said mernbers in. adjusted positions.

' 2. A diaphragn'i adjustn'ient for telephones and the like comprising a casing member, a cap member, a diaphragm carried by said cap member, means for holding said diaphragm 1n Silltlt'tll) member, said means having a notch therein, and a U-shapedspring secured in said notch adapted .to engage said casing member and hold said members in adjusted posit-ion.

3. A diaphragm for telephones and the like comprising a casing member having an open end, a cap for said casing member, a diaphragm carried by said-cap, an annular member for retaining sniddiaphragm in said cap, said annular member having a rectangular shaped notch therein, and a U-f' shaped spring mounted in said notch, one end of said spring bein secured to the bottom of said notch and ted other end extending beyond said annular member to engage interference the open end of said casing to hold said cap and casing in adjusted position.

4. A= diaphragm adjustment for telephones a nd the like compris'ng a casing member, a cap member, a diaphragm carried by said cap member, means to hold said dia-' phragm in place, a U-shaped spring adapted to engage said members and hold them in adjustment, one of said members having a notch therein in which said spring is socured, said notch being sufficiently deep to completely house said spring to avoid its with the adjustment of said members. l In witness whereof, I hereunto subscribe my name this 5th day of July A. D., 1917.

GEORGE E. MATHEB. 

